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125 lines
2.3 KiB
Rust
125 lines
2.3 KiB
Rust
// run-rustfix
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#![warn(clippy::all)]
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#![allow(
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clippy::blacklisted_name,
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clippy::no_effect,
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clippy::redundant_clone,
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redundant_semicolons,
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dead_code,
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unused_assignments
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)]
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struct Foo(u32);
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#[derive(Clone)]
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struct Bar {
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a: u32,
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b: u32,
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}
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fn field() {
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let mut bar = Bar { a: 1, b: 2 };
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std::mem::swap(&mut bar.a, &mut bar.b);
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let mut baz = vec![bar.clone(), bar.clone()];
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let temp = baz[0].a;
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baz[0].a = baz[1].a;
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baz[1].a = temp;
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}
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fn array() {
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let mut foo = [1, 2];
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foo.swap(0, 1);
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foo.swap(0, 1);
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}
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fn slice() {
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let foo = &mut [1, 2];
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foo.swap(0, 1);
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foo.swap(0, 1);
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}
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fn unswappable_slice() {
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let foo = &mut [vec![1, 2], vec![3, 4]];
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let temp = foo[0][1];
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foo[0][1] = foo[1][0];
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foo[1][0] = temp;
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// swap(foo[0][1], foo[1][0]) would fail
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// this could use split_at_mut and mem::swap, but that is not much simpler.
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}
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fn vec() {
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let mut foo = vec![1, 2];
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foo.swap(0, 1);
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foo.swap(0, 1);
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}
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fn xor_swap_locals() {
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// This is an xor-based swap of local variables.
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let mut a = 0;
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let mut b = 1;
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std::mem::swap(&mut a, &mut b)
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}
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fn xor_field_swap() {
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// This is an xor-based swap of fields in a struct.
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let mut bar = Bar { a: 0, b: 1 };
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std::mem::swap(&mut bar.a, &mut bar.b)
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}
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fn xor_slice_swap() {
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// This is an xor-based swap of a slice
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let foo = &mut [1, 2];
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foo.swap(0, 1)
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}
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fn xor_no_swap() {
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// This is a sequence of xor-assignment statements that doesn't result in a swap.
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let mut a = 0;
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let mut b = 1;
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let mut c = 2;
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a ^= b;
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b ^= c;
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a ^= c;
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c ^= a;
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}
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fn xor_unswappable_slice() {
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let foo = &mut [vec![1, 2], vec![3, 4]];
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foo[0][1] ^= foo[1][0];
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foo[1][0] ^= foo[0][0];
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foo[0][1] ^= foo[1][0];
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// swap(foo[0][1], foo[1][0]) would fail
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// this could use split_at_mut and mem::swap, but that is not much simpler.
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}
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fn distinct_slice() {
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let foo = &mut [vec![1, 2], vec![3, 4]];
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let bar = &mut [vec![1, 2], vec![3, 4]];
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std::mem::swap(&mut foo[0][1], &mut bar[1][0]);
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}
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#[rustfmt::skip]
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fn main() {
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let mut a = 42;
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let mut b = 1337;
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std::mem::swap(&mut a, &mut b);
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; std::mem::swap(&mut a, &mut b);
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let mut c = Foo(42);
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std::mem::swap(&mut c.0, &mut a);
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; std::mem::swap(&mut c.0, &mut a);
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}
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